“…Dry farmland and paddy land are mainly centralized in the middle and lower reaches of the river and their covers are N40% in farmland and farmland-residence zones. Additionally, the (Mayer et al, 2002;Kendall et al, 2007;Lee et al, 2008;Xue et al, 2009) in the Haicheng River basin, Northeast China (A, B, C, and D represent nitrogen sources from synthetic fertilizer, domestic sewage/manure, soil organic matter, and atmospheric deposition, respectively; z1-z6 denote forest-farmland, managed forest, farmland-livestock rearing, farmland, residence, and farmland-residence zones, respectively). proportions of dry farmland and paddy land reach maxima of 52.7% and 16.3% in the farmland-residence zone.…”